Rig-Rite's Description is below:

Deck Tie-down Turnbuckles listed below are commonly used on Masts produced by Isomat, Sparcraft and Charleston Spars. Turnbuckles connect Mast to Deck Collar to prevent the Deck from rising when shroud tension is applied. Stainless Steel Turnbuckles have an Upper 'T' fitting designed to fit special receptacles built into Deck Collars made by Isomat and Sparcraft. The Lower end is fitted with a Stemball or T-Ball and attached to the Mast using a Stemball Backing Shell or a T-Ball Backing Plate. Sometimes used singly attached on Mast front, and sometimes in pairs mounted port and starboard.

Stainless Steel Deck Tie-down Turnbuckle used with Isomat and Sparcraft Deck Collars. Tubular, Close-bodied Turnbuckle is secured with locking nuts, body features wrench flats and is marked with a line around the Left Hand end (6mm Turnbuckles have Single-thread). Upper 'T' End fits all Isomat and Sparcraft Deck Collars with Turnbuckle pockets, Lower Stemball End fits various Stemball Cup Washers and Stemball Backing Shells.

Available with 6mm, 10mm, 12mm, and 14mm Threads.